<template>
  <div id="app">
    <ul v-for="(item, index) in myArr" :key="index">
      <li>{{ item }}</li>
    </ul>
    <button @click="change">走一走</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      myArr: ["帅哥", "美女", "程序猿"],
      num: [],
    };
  },
  methods: {
    change() {
      this.myArr.push(this.myArr.shift());
    },
  },
};
</script>